Can a Disk Drive be Logically divided into three Partitions then?

Have W-7 installed on one Logical Partition, Windows-10 installed on the second Logical Partition and all the Programs and Data on the third Logical Partition?

If not, could Windows-7 be installed on one Disk Drive, Windows-10 be installed on another Disk Drive and a third Disk Drive with all the Programs and Data being shared between Disk One and Disk Two?

Mike

Mike Lynch said:

Have W-7 installed on one Logical Partition, Windows-10 installed on the second Logical Partition and all the Programs and Data on the third Logical Partition?

In contrast to a Primary partition, the term "Logical partition" traditionally means a logical volume within an "Extended" partition on an disk with a MBR partition table. I don't know if you specifically mean you're wanting to use one or more Extended/Logical partitions, but nevertheless, the answer is yes. Windows can be installed on any Primary or Logical partition, on any disk. The only requirement is the computer must boot from a Primary partition -- i.e., the Windows "System" partition must be on a Primary and must be marked as the "Active" partition in the partition table, if using an MBR-style disk.

If not, could Windows-7 be installed on one Disk Drive, Windows-10 be installed on another Disk Drive and a third Disk Drive with all the Programs and Data being shared between Disk One and Disk Two?

Technically, you install an OS on a partition, not a disk. It's irrelevant whether those partitions are on a single disk or spread across multiple disks, so this is no different than your first question above.

As for the wisdom of sharing a separate, common partition for programs, I do not recommend it. It's bound to lead to heartache down the road, with programs under one OS making changes to that OS partition that are not synced with the alternate OS partition.